Wikipedia: Higher-order function
The enum source module provides functional iteration helpers: map, filter, find, all, any, and each. Callbacks receive the key (index for arrays) and value as arguments.
fmt := import("fmt")
enum := import("enum")
nums := [1, 2, 3, 4, 5]doubled := enum.map(nums, func(_, v) { return v * 2 })
fmt.println(doubled)evens := enum.filter(nums, func(_, v) { return v%2 == 0 })
fmt.println(evens)first := enum.find(nums, func(_, v) { return v > 3 })
fmt.println(first)fmt.println(enum.all(nums, func(_, v) { return v > 0 }))
fmt.println(enum.all(nums, func(_, v) { return v > 3 }))fmt.println(enum.any(nums, func(_, v) { return v > 4 }))try it
[2, 4, 6, 8, 10] [2, 4] 4 true false true